tools: bpf_jit_disasm: check for klogctl failure
klogctl can fail and return -ve len, so check for this and
return NULL to avoid passing a (size_t)-1 to malloc.
Signed-off-by: Colin Ian King <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
diff --git a/tools/net/bpf_jit_disasm.c b/tools/net/bpf_jit_disasm.c
index 5b32413..544b05a 100644
--- a/tools/net/bpf_jit_disasm.c
+++ b/tools/net/bpf_jit_disasm.c
@@ -98,6 +98,9 @@
char *buff;
len = klogctl(CMD_ACTION_SIZE_BUFFER, NULL, 0);
+ if (len < 0)
+ return NULL;
+
buff = malloc(len);
if (!buff)
return NULL;
